野球の打撃における上肢の動作に関するキネマティクス的研究：ヘッドスピード上位群と下位群のスイング局面の比較
スポンサーリンク
概要
- 論文の詳細を見る
The purpose of this study was to analyze three-dimensionally two groups of baseball strikers, i.e. high and low swing speed groups, and to compare the kinematics of their upper limb motion. Sixteen skilled male strikers were videotaped with two synchronized high-speed video cameras operating at 200 Hz. One trial in which the maximum bat head speed was achieved was selected for each subject and digitized to obtain three-dimensional coordinates of the segment end-points and the bat using a DLT technique. Subjects were divided into High (n=8) and Low (n=8) groups according to the bat head speed. The angles compared between the two groups were abduction-adduction, horizontal abduction-adduction, flexion-extension and internal-external rotation for both shoulders, flexion-extension for both elbows, supination-pronation for both forearms, radius-ulnar flexion, and dorsi-palmar flexion for both hands. The sequential data were normalized with the time from the point when the speed of the grip was over 3 m/s to the ball impact, and then averaged.1 Angles of elbow extension, forearm supination of the top arm, and ulnar flexion of both hands were much changed. However, the angles of both shoulder joints, bottom elbow and bottom forearm showed little change.2. The High group showed significantly larger shoulder adduction and horizontal adduction of a bottom arm than the Low group in 0–10% time and 50–70% time (p<0.05). The High group showed significantly smaller top elbow extension than the Low group in 40–70% time and 90–100% time (p<0.05).3. The High group showed significantly smaller top hand supination than the Low group in 100% time. In the time, the High group showed significantly larger bottom forearm pronation than the Low group in 50–70% time (p<0.05). The High group showed significantly larger dorsiflexion of the bottom hand than the Low group in 20–30% time (p<0.05).
- Japan Society of Physical Education, Health and Sport Sciencesの論文
Japan Society of Physical Education, Health and Sport Sciences | 論文
- The Genealogy of Power : Historical and Philosophical Considerations about Doping
- Motivational Profiles and Stages of Exercise Behavior Change
- Effects of Exercise and Nutritional Intervention to Improve Physical Factors Associated with Fracture Risk in Middle-aged and Older Women
- The Effect of Sprint Training on Skeletal Muscle Carnosine in Humans
- Behavior of Fascicle and Tendinous Tissue of Medial Gastrocnemius Muscle during Rebound Exercise of Ankle Joint